We once had a Quarter Horse that grew until
he was 6. Ever since then, I have been aware of this possibility when I
estimate a horse's maximum mature height.
Well, I never believed they could grow much after
age 4....
But a friend bought an Arab/Andalusian cross mare
that I rejected at age 5, since she was 14.3....just sticked her recently at
age 8 and she is right about 15.2.....
Also, my Arab/QH mare, grew to just under 16h in
her 6th year (one inch).....I am ready for HER to stop growing!
They can grow well past 5, too. I
bought one last Feb., he measured 14.3 1/2h with a stick and level.
Perfect height. He was almost 6. As the year wore on, I swore he
was getting harder to get on. Measured him a couple of months ago with
same stick and level...#$%@ horse is now 15.1 1/2h. Grew 2 inches in
less than a year. I've told him to knock it off, it ain't
funny.